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Measurement Uncertainty Analysis – Power Reference Level Test
Measurement Introduction
1. Measurement 5 was discounted from the calculations as being an extraneous
measurement.
The readings in Table B-1 are in milli-Watts, therefore the Standard Deviation (worse
case) is: - U (Rep) = 0.057 µWatts
Sensitivity Coefficients (Ci)
The sensitivity coefficients should be evaluated using the best estimate of V
V
, R, CF and M
0
V
comp
V
1
V
0
1
R
CF
1. The resistance on the 432A Power meters is set to 200ohms for this test
2. The average Calibration Factor from the previous six sensors on the Production Line
The best guess for the Mismatch of the P
shown earlier is:
This equation shows that if an infinite amount of readings of mismatch were taken
between P
C-10
Table B-1: Measurement Repeatability Results
Measurement
Min
Average
SD
I mW Power Measured = f(V
. The nominal values for V
s
= 4.857 V
= 83.12 mV
= 96.17 µV
= 200 Ω
2
= 97.5%
= 0.975
(
±
M s
=
P
1
out
P
the mean value would equal 1.
s
d
ADJUST REF.
REF. LEVEL TEST
0.999406
0.999529
5.67E-05
, V
, V
, R, CF, M
comp
1
0
, V
, V
comp
1
0
P
is = 1. Output power of the source as
s
d
⋅
⋅
)
(
)
≈
2 P s P d
1
Agilent E4416A/E4417A Service Guide
0.999377721
0.999504053
5.01868E-05
)
s
, V
comp
1
, R, and CF are
,
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